435 lines
11 KiB
C++
435 lines
11 KiB
C++
/*
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* Copyright © 2009 Red Hat, Inc.
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* Copyright © 2011 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#include "hb.hh"
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#include "hb-glib.h"
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#include "hb-unicode.hh"
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#include "hb-machinery.hh"
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#if !GLIB_CHECK_VERSION(2,29,14)
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static const hb_script_t
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glib_script_to_script[] =
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{
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HB_SCRIPT_COMMON,
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HB_SCRIPT_INHERITED,
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HB_SCRIPT_ARABIC,
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HB_SCRIPT_ARMENIAN,
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HB_SCRIPT_BENGALI,
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HB_SCRIPT_BOPOMOFO,
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HB_SCRIPT_CHEROKEE,
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HB_SCRIPT_COPTIC,
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HB_SCRIPT_CYRILLIC,
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HB_SCRIPT_DESERET,
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HB_SCRIPT_DEVANAGARI,
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HB_SCRIPT_ETHIOPIC,
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HB_SCRIPT_GEORGIAN,
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HB_SCRIPT_GOTHIC,
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HB_SCRIPT_GREEK,
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HB_SCRIPT_GUJARATI,
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HB_SCRIPT_GURMUKHI,
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HB_SCRIPT_HAN,
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HB_SCRIPT_HANGUL,
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HB_SCRIPT_HEBREW,
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HB_SCRIPT_HIRAGANA,
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HB_SCRIPT_KANNADA,
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HB_SCRIPT_KATAKANA,
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HB_SCRIPT_KHMER,
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HB_SCRIPT_LAO,
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HB_SCRIPT_LATIN,
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HB_SCRIPT_MALAYALAM,
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HB_SCRIPT_MONGOLIAN,
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HB_SCRIPT_MYANMAR,
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HB_SCRIPT_OGHAM,
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HB_SCRIPT_OLD_ITALIC,
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HB_SCRIPT_ORIYA,
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HB_SCRIPT_RUNIC,
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HB_SCRIPT_SINHALA,
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HB_SCRIPT_SYRIAC,
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HB_SCRIPT_TAMIL,
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HB_SCRIPT_TELUGU,
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HB_SCRIPT_THAANA,
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HB_SCRIPT_THAI,
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HB_SCRIPT_TIBETAN,
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HB_SCRIPT_CANADIAN_SYLLABICS,
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HB_SCRIPT_YI,
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HB_SCRIPT_TAGALOG,
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HB_SCRIPT_HANUNOO,
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HB_SCRIPT_BUHID,
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HB_SCRIPT_TAGBANWA,
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/* Unicode-4.0 additions */
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HB_SCRIPT_BRAILLE,
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HB_SCRIPT_CYPRIOT,
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HB_SCRIPT_LIMBU,
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HB_SCRIPT_OSMANYA,
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HB_SCRIPT_SHAVIAN,
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HB_SCRIPT_LINEAR_B,
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HB_SCRIPT_TAI_LE,
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HB_SCRIPT_UGARITIC,
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/* Unicode-4.1 additions */
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HB_SCRIPT_NEW_TAI_LUE,
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HB_SCRIPT_BUGINESE,
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HB_SCRIPT_GLAGOLITIC,
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HB_SCRIPT_TIFINAGH,
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HB_SCRIPT_SYLOTI_NAGRI,
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HB_SCRIPT_OLD_PERSIAN,
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HB_SCRIPT_KHAROSHTHI,
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/* Unicode-5.0 additions */
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HB_SCRIPT_UNKNOWN,
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HB_SCRIPT_BALINESE,
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HB_SCRIPT_CUNEIFORM,
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HB_SCRIPT_PHOENICIAN,
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HB_SCRIPT_PHAGS_PA,
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HB_SCRIPT_NKO,
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/* Unicode-5.1 additions */
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HB_SCRIPT_KAYAH_LI,
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HB_SCRIPT_LEPCHA,
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HB_SCRIPT_REJANG,
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HB_SCRIPT_SUNDANESE,
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HB_SCRIPT_SAURASHTRA,
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HB_SCRIPT_CHAM,
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HB_SCRIPT_OL_CHIKI,
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HB_SCRIPT_VAI,
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HB_SCRIPT_CARIAN,
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HB_SCRIPT_LYCIAN,
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HB_SCRIPT_LYDIAN,
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/* Unicode-5.2 additions */
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HB_SCRIPT_AVESTAN,
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HB_SCRIPT_BAMUM,
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HB_SCRIPT_EGYPTIAN_HIEROGLYPHS,
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HB_SCRIPT_IMPERIAL_ARAMAIC,
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HB_SCRIPT_INSCRIPTIONAL_PAHLAVI,
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HB_SCRIPT_INSCRIPTIONAL_PARTHIAN,
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HB_SCRIPT_JAVANESE,
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HB_SCRIPT_KAITHI,
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HB_SCRIPT_TAI_THAM,
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HB_SCRIPT_LISU,
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HB_SCRIPT_MEETEI_MAYEK,
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HB_SCRIPT_OLD_SOUTH_ARABIAN,
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HB_SCRIPT_OLD_TURKIC,
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HB_SCRIPT_SAMARITAN,
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HB_SCRIPT_TAI_VIET,
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/* Unicode-6.0 additions */
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HB_SCRIPT_BATAK,
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HB_SCRIPT_BRAHMI,
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HB_SCRIPT_MANDAIC,
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/* Unicode-6.1 additions */
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HB_SCRIPT_CHAKMA,
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HB_SCRIPT_MEROITIC_CURSIVE,
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HB_SCRIPT_MEROITIC_HIEROGLYPHS,
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HB_SCRIPT_MIAO,
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HB_SCRIPT_SHARADA,
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HB_SCRIPT_SORA_SOMPENG,
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HB_SCRIPT_TAKRI
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};
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#endif
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hb_script_t
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hb_glib_script_to_script (GUnicodeScript script)
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{
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#if GLIB_CHECK_VERSION(2,29,14)
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return (hb_script_t) g_unicode_script_to_iso15924 (script);
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#else
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if (likely ((unsigned int) script < ARRAY_LENGTH (glib_script_to_script)))
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return glib_script_to_script[script];
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if (unlikely (script == G_UNICODE_SCRIPT_INVALID_CODE))
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return HB_SCRIPT_INVALID;
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return HB_SCRIPT_UNKNOWN;
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#endif
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}
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GUnicodeScript
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hb_glib_script_from_script (hb_script_t script)
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{
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#if GLIB_CHECK_VERSION(2,29,14)
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return g_unicode_script_from_iso15924 (script);
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#else
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unsigned int count = ARRAY_LENGTH (glib_script_to_script);
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for (unsigned int i = 0; i < count; i++)
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if (glib_script_to_script[i] == script)
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return (GUnicodeScript) i;
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if (unlikely (script == HB_SCRIPT_INVALID))
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return G_UNICODE_SCRIPT_INVALID_CODE;
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return G_UNICODE_SCRIPT_UNKNOWN;
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#endif
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}
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static hb_unicode_combining_class_t
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hb_glib_unicode_combining_class (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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return (hb_unicode_combining_class_t) g_unichar_combining_class (unicode);
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}
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static unsigned int
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hb_glib_unicode_eastasian_width (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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return g_unichar_iswide (unicode) ? 2 : 1;
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}
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static hb_unicode_general_category_t
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hb_glib_unicode_general_category (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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/* hb_unicode_general_category_t and GUnicodeType are identical */
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return (hb_unicode_general_category_t) g_unichar_type (unicode);
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}
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static hb_codepoint_t
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hb_glib_unicode_mirroring (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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g_unichar_get_mirror_char (unicode, &unicode);
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return unicode;
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}
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static hb_script_t
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hb_glib_unicode_script (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t unicode,
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void *user_data HB_UNUSED)
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{
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return hb_glib_script_to_script (g_unichar_get_script (unicode));
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}
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static hb_bool_t
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hb_glib_unicode_compose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t a,
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hb_codepoint_t b,
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hb_codepoint_t *ab,
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void *user_data HB_UNUSED)
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{
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#if GLIB_CHECK_VERSION(2,29,12)
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return g_unichar_compose (a, b, ab);
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#endif
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/* We don't ifdef-out the fallback code such that compiler always
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* sees it and makes sure it's compilable. */
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gchar utf8[12];
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gchar *normalized;
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int len;
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hb_bool_t ret;
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len = g_unichar_to_utf8 (a, utf8);
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len += g_unichar_to_utf8 (b, utf8 + len);
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normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFC);
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len = g_utf8_strlen (normalized, -1);
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if (unlikely (!len))
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return false;
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if (len == 1) {
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*ab = g_utf8_get_char (normalized);
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ret = true;
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} else {
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ret = false;
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}
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g_free (normalized);
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return ret;
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}
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static hb_bool_t
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hb_glib_unicode_decompose (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t ab,
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hb_codepoint_t *a,
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hb_codepoint_t *b,
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void *user_data HB_UNUSED)
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{
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#if GLIB_CHECK_VERSION(2,29,12)
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return g_unichar_decompose (ab, a, b);
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#endif
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/* We don't ifdef-out the fallback code such that compiler always
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* sees it and makes sure it's compilable. */
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gchar utf8[6];
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gchar *normalized;
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int len;
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hb_bool_t ret;
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len = g_unichar_to_utf8 (ab, utf8);
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normalized = g_utf8_normalize (utf8, len, G_NORMALIZE_NFD);
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len = g_utf8_strlen (normalized, -1);
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if (unlikely (!len))
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return false;
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if (len == 1) {
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*a = g_utf8_get_char (normalized);
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*b = 0;
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ret = *a != ab;
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} else if (len == 2) {
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*a = g_utf8_get_char (normalized);
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*b = g_utf8_get_char (g_utf8_next_char (normalized));
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/* Here's the ugly part: if ab decomposes to a single character and
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* that character decomposes again, we have to detect that and undo
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* the second part :-(. */
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gchar *recomposed = g_utf8_normalize (normalized, -1, G_NORMALIZE_NFC);
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hb_codepoint_t c = g_utf8_get_char (recomposed);
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if (c != ab && c != *a) {
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*a = c;
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*b = 0;
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}
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g_free (recomposed);
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ret = true;
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} else {
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/* If decomposed to more than two characters, take the last one,
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* and recompose the rest to get the first component. */
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gchar *end = g_utf8_offset_to_pointer (normalized, len - 1);
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gchar *recomposed;
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*b = g_utf8_get_char (end);
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recomposed = g_utf8_normalize (normalized, end - normalized, G_NORMALIZE_NFC);
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/* We expect that recomposed has exactly one character now. */
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*a = g_utf8_get_char (recomposed);
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g_free (recomposed);
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ret = true;
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}
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g_free (normalized);
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return ret;
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}
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static unsigned int
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hb_glib_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs HB_UNUSED,
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hb_codepoint_t u,
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hb_codepoint_t *decomposed,
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void *user_data HB_UNUSED)
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{
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#if GLIB_CHECK_VERSION(2,29,12)
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return g_unichar_fully_decompose (u, true, decomposed, HB_UNICODE_MAX_DECOMPOSITION_LEN);
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#endif
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/* If the user doesn't have GLib >= 2.29.12 we have to perform
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* a round trip to UTF-8 and the associated memory management dance. */
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gchar utf8[6];
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gchar *utf8_decomposed, *c;
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gsize utf8_len, utf8_decomposed_len, i;
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/* Convert @u to UTF-8 and normalise it in NFKD mode. This performs the compatibility decomposition. */
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utf8_len = g_unichar_to_utf8 (u, utf8);
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utf8_decomposed = g_utf8_normalize (utf8, utf8_len, G_NORMALIZE_NFKD);
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utf8_decomposed_len = g_utf8_strlen (utf8_decomposed, -1);
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assert (utf8_decomposed_len <= HB_UNICODE_MAX_DECOMPOSITION_LEN);
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for (i = 0, c = utf8_decomposed; i < utf8_decomposed_len; i++, c = g_utf8_next_char (c))
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*decomposed++ = g_utf8_get_char (c);
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g_free (utf8_decomposed);
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return utf8_decomposed_len;
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}
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#ifdef HB_USE_ATEXIT
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static void free_static_glib_funcs (void);
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#endif
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static struct hb_glib_unicode_funcs_lazy_loader_t : hb_unicode_funcs_lazy_loader_t<hb_glib_unicode_funcs_lazy_loader_t>
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{
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static inline hb_unicode_funcs_t *create (void)
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{
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hb_unicode_funcs_t *funcs = hb_unicode_funcs_create (nullptr);
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#define HB_UNICODE_FUNC_IMPLEMENT(name) \
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hb_unicode_funcs_set_##name##_func (funcs, hb_glib_unicode_##name, nullptr, nullptr);
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HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
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#undef HB_UNICODE_FUNC_IMPLEMENT
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hb_unicode_funcs_make_immutable (funcs);
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#ifdef HB_USE_ATEXIT
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atexit (free_static_glib_funcs);
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#endif
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return funcs;
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}
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} static_glib_funcs;
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#ifdef HB_USE_ATEXIT
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static
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void free_static_glib_funcs (void)
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{
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static_glib_funcs.free_instance ();
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}
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#endif
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hb_unicode_funcs_t *
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hb_glib_get_unicode_funcs (void)
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{
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return static_glib_funcs.get_unconst ();
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}
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#if GLIB_CHECK_VERSION(2,31,10)
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static void
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_hb_g_bytes_unref (void *data)
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{
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g_bytes_unref ((GBytes *) data);
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}
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/**
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* hb_glib_blob_create:
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*
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* Since: 0.9.38
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**/
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hb_blob_t *
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hb_glib_blob_create (GBytes *gbytes)
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{
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gsize size = 0;
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gconstpointer data = g_bytes_get_data (gbytes, &size);
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return hb_blob_create ((const char *) data,
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size,
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HB_MEMORY_MODE_READONLY,
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g_bytes_ref (gbytes),
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_hb_g_bytes_unref);
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}
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#endif
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